大负数上的 Javascript parseInt 给出 NaN
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Javascript parseInt on large negative number gives NaN
提问by Rishi
When I do this:
当我这样做时：
var x = parseInt("–2147483648");
console.log(x);
I get the value as:
我得到的价值为：
NaN
Why does this happen?
为什么会发生这种情况？
I want to test if a number is in the range of C (int), so I am doing the above, but it does not work. Also, I want to do this for C (long), is there a way to this?
我想测试一个数字是否在C(int)的范围内，所以我在做上面的，但它不起作用。另外，我想为 C（长）做这个，有没有办法做到这一点？
For example: If I do:
例如：如果我这样做：
var x = parseInt("-9223372036854775808");
console.log(x);
Now, I know that (-+)2^53 is the limit of numbers in Javascript. Is there some other way to test if the given value in a form is actually in the range of long or int?
现在，我知道 (-+)2^53 是 Javascript 中的数字限制。是否有其他方法可以测试表单中的给定值是否实际上在 long 或 int 的范围内？
回答by elclanrs
It should work fine, the problem is that you're using the wrong character, an ndash –vs a hyphen -:
它应该可以正常工作，问题是您使用了错误的字符，ndash–与连字符-：
var x = parseInt("-2147483648");
console.log(x);
If you copy/paste that you'll see that it works now.
如果你复制/粘贴，你会看到它现在可以工作。
